Hot rolled descaled steel coils - TDM
The wustite closest to the base metal substrate has a higher stability and lower oxygen content, and is therefore more resistant to corrosion.
DD11 - DD12
S235JR - S275JR - S355JR - S355J2+N
S355MC - S420MC - S500MC
All other qualities available on request up to a yield strength 700Mpa. Possibility of toll manufacturing.
Coils up to 38 Mt
Thickness from 1 mm to 15 mm
Width up to 2100 mm
Advantages over Pickled and Oiled Material
• Longer shelf life, with no need to apply a protective layer of oil.
• Smooth, clean, and oil-free material means improved industrial processes such as laser cutting, welding, batch galvanization, and post painting.
• Parts and components obtained with TDM call for neither shot blasting nor degreasing before galvanizing or painting.
• Cleaner material means less dirt on equipment, tools and in storage areas.
• This ecological process avoids the use of acid, heating, and oiling for protective purposes.
Todoaceros provides descaled steel sheets that...
... are flat ...
… have an improved surface …
… are corrosion-resistant …
… require no protective oil …
Also, a clean and oil-free surface means less dirt in the storage area, working spaces, and on tools and equipment. .
… feature faster cutting speed ...
… are environmentally friendly.
Weld strength test of TDM sheets
2- Shear test indicate that weld integrity and fusion to base material is higher for descaled material that P&O hot rolled.
Shielding gas: Argon / 3-5% Oxygen according to EN439M22 with a flow rate of 0.70 and 0.85 m3/h (25-30 CFH)
Wire speed and voltages:
10m/min 24 volts
11m/min 24 volts
12m/min 25 volts
13m/min 26 volts
The 95%Ar/5%O2 achieves spray arc mode, which minimizes spatter and produces a very uniform bead, allowing for a decreased wire feed speed. To avoid porosity from the O2 in the gas, the filler wire must have oxidizers. ENG3Sil and ENG4Sil has a high manganese content which serve this purpose.
Shielding gas: Argon with flow rate of 0.6 – 0.7 m3/h (15-20 CFH)
Amperage: 50-150A based on metal thickness
Voltage: 10-14 volts.
While MIG welding of carbon steels is preferable to TIG welding, mechanical discaled material does weld effectively because of its cleanliness. Areas to be welded must be free from moisture, oil and contaminants. A filler rod must be used to avoid porosity.
Tip force: 2850 N +/- 150 N
Weld (Heat): 12,000 A +/- 300 A
Weld Time: 0,1 s / 0,2 s (5-10 Hz)
The electrical resistivity results show that descaled material has no more resistance to spot welding than does P&O and in fact has considerably less resistance than hot rolled black. Oxide pick-up when spot welding descaled material is considerably less than P&O and HRB.